Will Carruthers, THE BOHEMIAN
The river winding through downtown Petaluma might be the city’s single most defining feature. The city’s annual Rivertown Revival Festival features views of the river and, farther south, recreationists use the water for entertainment and exercise every day.
Yet, since 1975, the state has designated the water a contaminated water body due to excessive levels of bacteria tied to fecal matter. The river has also been included on the list for excessive amounts of pesticides, trash and sediment at other times.
Now, a state water oversight board may pass a plan laying out the steps to lower the levels of bacteria in the river and its watershed.
At a Wednesday, Nov. 13 meeting in Oakland, the San Francisco Bay Regional Water Quality Control Board will consider approving an amendment to the board’s water quality control plan for the region, a document known as a basin plan. The proposed amendment will set a cap on the amount of fecal indicator bacteria in the river’s watershed—the TMDL—and identify actions required to reach that goal.
The federal Clean Water Act requires the state to create the cap and cleanup plan, known as a Total Maximum Daily Load [TMDL].
Staff members working for the water board, one of nine similar regional bodies tasked with setting water quality rules in California, have been assembling the Petaluma River plan for several years, according to Farhad Ghodrati, an environmental scientist with the San Francisco Bay board.
Although there are over 100 potentially dangerous bacteria related to fecal matter, scientists generally only test for a few varieties. These “fecal indicator bacteria,” including E. Coli, are a sign that animal waste has contaminated the water body. If those levels are above the bar set by the water quality control board, they add the water body to a list of “impaired” waterways.